Improved oxidation in the Witten-Hercules process for preparing dimethyl terephthalate

The invention relates to a process for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimethyl terephthalate in at least two sequentially arranged part-stages and in the presence of a catalyst. It involves oxidizing in at lea...

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Main Authors JELKO, STEFAN, KORTE, HERMANN-JOSEF, FRANZ, GERHARD, SREBNY, HANS-GUNTHER, SCHOENGEN, ANTON
Format Patent
LanguageEnglish
Published 01.11.2001
Edition7
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention relates to a process for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimethyl terephthalate in at least two sequentially arranged part-stages and in the presence of a catalyst. It involves oxidizing in at least one p-xylene-rich part-stage some of the p-xylene, with or without recirculated products having oxidizable contents from subsequent stages of the DMT process, in the presence of 5 to 30 percent by mass of methyl p-tolulate, based on the oxidation mixture of the part-stage, and/or in at least one further methyl p-tolulate-rich part-stage, oxidizing methyl p-tolulate and/or p-toluic acid with or without recirculated products in the presence of 2 to 30 percent by mass of p-xylene, based on the total of methyl p-tolulate and p-toluic acid.
Bibliography:Application Number: TW199786114855